ProLigno / ProLigno 2008 Numarul 2  
     
 
 
   
 

 

 

 

 

 

 

 

CERCETARI PRIVIND PRELUCRABILITATEA PRIN FERASTRUIRE A LEMNULUI DE MOLID INGHETAT SI NEINGHETAT

Mihai ISPAS
Prof.dr.ing. - Universitatea "Transilvania" din Brasov - Facultatea de Industria Lemnului Adresa: B-dul Eroilor nr. 29, 500036 Brasov, Romania Tel.: +40 268 419581. Fax: +40 268 419581
E-mail: ispas.m@unitbv.ro


Mihaela CAMPEAN
Prof.dr.ing. - Universitatea "Transilvania" din Brasov - Facultatea de Industria Lemnului Adresa: B-dul Eroilor nr. 29, 500036 Brasov, Romania Tel.: +40 268 419581. Fax: +40 268 419581
E-mail: campean@unitbv.ro


Rezumat:
Lucrarea prezinta rezultatele unei cercetari efectuate in scopul stabilirii daca proprietatile lemnului de molid inghetat (in conditii de iarna) sunt diferite de cele ale lemnului neinghetat in ceea ce priveste prelucrarea sa. Epruvetele din lemn de molid, debitate din acelasi bustean, au fost, jumatate dintre acestea, inghetate la -30°C, iar cealalta jumatate lasate neinghetate, dupa care au fost ferastruite in conditii absolut identice de prelucrare (aceeasi masina, aceeasi scula, aceleasi dispozitive si aceleasi regimuri de aschiere), pentru a determina comparativ consumurile energetice in cele doua cazuri. Rezultatele obtinute au relevat ca inghetarea determina o reducere vizibila a puterii necesare de taiere, respectiv aparenta reducere a rezistentelor mecanice ale lemnului.

Cuvinte cheie: lemn inghetat, molid, putere de aschiere, consum energetic, rezistente mecanice.

BIBLIOGRAFIE
CAMPEAN, M. (2007). Study Concerning the Possibility of Removing Water From Wood Through Freezing-Defreezing Cycles. In: Proceedings of 10th International IUFRO Wood Drying Conference, Orono-Maine (USA), August 2007, pp. 106-111.
CAMPEAN, M.; ISPAS, M.; POROJAN, M. (2008). Considerations on Drying Frozen Spruce Wood and Effects upon Its Properties. Drying Technology, Volume 26 (5): 596 - 601.
CIVIDINI, R. (2001). Conventional Kiln-Drying of Lumber. Nardi S.p.A., 2001, 64 pages.
ERICKSON, R.W. (1969). Effect of Prefreezing Upon Hygroscopicity and Shrinkage of Thin Cross Sections of California Redwood. Forest Products Journal 19(5): 55-56.
ILIC, J. (1995). Advantages of Pre-Freezing for Reducing Shrinkage-Related Degrade in Eucalyptus: General Considerations and Review of Literature. Wood Science and Technology 29(4): 277-285.
ISPAS, M. (2000). Contributii la studiul prelucrarii lemnului pe masinile de frezat cu ax vertical in vederea optimizarii constructive si functionale (Contributions to the Study of Wood Processing on Vertical Moulders With a View to Constructive and Functional Optimization). PhD thesis. "Transilvania" University of Brasov.
ISPAS, M.; CAMPEAN, M. (2007). Upon the Workability of Frozen and Unfrozen Spruce Wood After Drying. In: Proceedings of ICWSE-2007, Brasov (Romania), June 2007, pp. 255-262.
KIVIMAA, E. (1950). Cutting Force in Wood Working. PhD Thesis. Pub. No. 18. Finland Institute of Techology, Helsinki.
KOLLMANN, F.; COTE, W.A., Jr. (1968). Principles of Wood Science and Technology Vol. I. Solid Wood. Springer-Verlag, New York. 592 pp.
KORKEAKANGAS, O. (2005). Frozen Wood - An Extracost to Sawmills. Presentation at the 1st COST E35 Workshop on Processing of Frozen Wood, Lappeenranta University of Technology, Lappeenranta (Finland).
ORLOWSKI, K.A.; SANDAK, J. (2005). Analysis of Specific Cutting Resistance While Cutting Frozen p
Pine Blocks with Narrow-Kerf Stellite Tipped Saws on Frame Sawing Machines. Presentation at the 1st COST E35 Workshop on Processing of Frozen Wood, Lappeenranta University of Technology, Lappeenranta (Finland).
SANDQVIST, I. (1986). Winter Sawing. Summary of Practical Experiences from Sawmill Industry. Träteknik Centrum Rapport I 8605035, Stockholm, September 1986.
TASKINEN, L. (2005). Problems on Sawing Frozen Logs. Presentation at the 1st COST E35 Workshop on Processing of Frozen Wood, Lappeenranta University of Technology, Lappeenranta (Finland).
VAZQUEZ-COOZ, I.; MEYER, R. W. (2006). Cutting Forces for Tension and Normal Wood of Maple. Forest Products Journal, April 2006.
*** EN 13183-1:2003. Moisture Content of Timber. Part 1: Determination by Oven-Dry Method.


 

 
Pagina creata de Costel AGACHE. Intretinere pagina Luminita Brenci. Ultima actualizare, 21 Iunie 2008